a1 = List()
a2 = Set()
a3 = new Listing {}

b1 = Map()
b2 = new Mapping {}
b3 = new Dynamic {}

nested {
  a1 = List()
  a2 = Set()
  a3 = new Listing {}

  b1 = Map()
  b2 = new Mapping {}
  b3 = new Dynamic {}
}

output {
  renderer = new JsonRenderer {}
}
